Move yamllint into a separate GH workflow (#2493)

Author: ipspace

.github/workflows/t-yamllint.yml

@@ -0,0 +1,29 @@
+name: Check YAML file syntax
+on:
+  push:
+    branches-ignore: [ devc ]
+    paths:
+    - '**.yml'
+
+  pull_request:
+    paths:
+    - '**.yml'
+
+jobs:
+  tests:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Python
+      uses: actions/setup-python@v5
+      with:
+        python-version: 3.13
+    - name: Install yamllint
+      run: |
+        python -m pip install yamllint
+    - name: Lint YAML files
+      run: |
+        set -e
+        shopt -s extglob
+        shopt -s globstar
+        yamllint --no-warnings netsim/*.yml netsim/**/*.yml tests/**/*.yml

.github/workflows/tests.yml

@@ -5,11 +5,12 @@ on:
     branches-ignore: [ devc ]
     paths:
     - '**.py'
-    - '**.yaml'
+    - '**.yml'
+
   pull_request:
     paths:
     - '**.py'
-    - '**.yaml'
+    - '**.yml'
 
 jobs:
   tests:
@@ -28,12 +29,6 @@ jobs:
       run: |
         python -m pip install --upgrade pip
         pip install -r requirements.txt -r requirements-dev.txt
-    - name: Lint YAML files
-      run: |
-        set -e
-        shopt -s extglob
-        shopt -s globstar
-        yamllint --no-warnings netsim/*.yml netsim/**/*.yml tests/**/*.yml
     - name: Run Mypy
       run: |
         set -e